With geometry only slightly out of calibration as you state, I wouldn't mind about the slight influence. In general, it's less of a shift than what you cause by adjusting, i.e. if you straighten by

Today a little DVM is easy and tiny, but back then, it was a mess of digital circuitry. The DVMs they made for the TM500 frames aren't exactly empty shells. Today I would take a 8 pin DIP/SOIC

adjusting geometry will be a problem as it changes the relationship between the vertical/horizontal amplifiers and the divisions on the screen. Its purpose is to warp the deflection field so that the

While working on these 7A13s, I often wondered why Tek didn't just put the Vc comparison voltage display right on the CRT readout. There's a whole blank lower readout spot available, but they opted

Unfortunately, you can't measure or adjust a scope accurately with a pulse that narrow. This can also be a problem with avalanche pulsers.

Adjusting Geometry should not be a problem. Just placing the jumper in the CAL position is no problem but make sure you don't select or even do any of the "fly-by-wire" adjustments. The unsafe ones

It's not only the edge focus, there is tiny bit of curvature on the delta_t cursors when I move them close to the left/right sides. So I plan to do to the CAL08 which needs the jumper to be positioned

CRT adjustments like trace rotation, (edge/high drive) focus and grid bias have no influence on calibration status. Still, since you mention only edge focus to be slightly off, I would just touch the

Thanks for your contributions, Ed. I will be following your work with interest. Dave Wise

yes, maybe that pin is somehow disconnected although physically the J119 socket seems very fine and pretty much untouched in the past. I just found pin 17 of J511 on A5 thanks to your lead. This is

Hi Cliff, Thanks for the update. I would appreciate updates from Nathan on the progress of his replacement RAM/ROM card. Dennis Tillman W7PF

I'm wrapping up this 7A13 project for now, but wanted to offer some suggestions for those with busted mechanical readout type 7A13s. I will start a fresh thread for this. Ed

as I explained, the voltage on pin 13 of J119 is zero and everything with the scope works! I have checked it many times.

Since you're writing that your 2465A operates correctly, incl. cursor movement etc., it seems a simple case of a broken connection to J119 pin 13. Since you need that pin only for calibration, you may

The DAC adjustment section is clearly detailed in the calibration section of the manual, to wit, section 5-10. To do the adjustment, you have to be using a DVM in DC mode, and measure between J119

The 500 series was never a quiet scope. The air motion is pretty loud. It is actually better for noise if the fan blades are not all perfectly the same. Perfection allows the creation of

I recently obtained a very cheap 2465A (US $180 delivered) and just recapped it. The serial number is B019XXX All voltages on J119 are now perfect both in terms of DC value and noise. Everything

Hi Group, The fan on my 536 is in good overall condition, motor bearings are fine, but it vibrates considerably and produces annoying low freq noise. I did my best to square the blades using a black

On Tue, 14 Nov 2017, 'Leon Vogt' leevogt@... [TekScopes] wrote: There is yet another option :) One can use HP 33002A SRD Module driven with 500 mW (~27dBm) 100 MHz sinusoidal signal. That will

Craig: I agree with you that Leo's Pulsar deserves consideration. The software options, quality of build and price are very attractive. I received mine in under a week. I turned around and ordered